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Smack changes for 5.16 

Multiple corrections to smackfs.
 W=1 fixes
 Fix for overlayfs.
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Merge tag 'Smack-for-5.16' of https://github.com/cschaufler/smack-next

Pull smack updates from Casey Schaufler:
 "Multiple corrections to smackfs:

   - a change for overlayfs support that corrects the initial attributes
     on created files

   - code clean-up for netlabel processing

   - several fixes in smackfs for a variety of reasons

   - Errors reported by W=1 have been addressed

  All told, nothing challenging"

* tag 'Smack-for-5.16' of https://github.com/cschaufler/smack-next:
  smackfs: use netlbl_cfg_cipsov4_del() for deleting cipso_v4_doi
  smackfs: use __GFP_NOFAIL for smk_cipso_doi()
  Smack: fix W=1 build warnings
  smack: remove duplicated hook function
  Smack:- Use overlay inode label in smack_inode_copy_up()
  smack: Guard smack_ipv6_lock definition within a SMACK_IPV6_PORT_LABELING block
  smackfs: Fix use-after-free in netlbl_catmap_walk()
This commit is contained in:
Linus Torvalds 2021-11-01 17:34:02 -07:00
parent f2786f43c9 0934ad42bb
commit 6f2b76a4a3
3 changed files with 34 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
security/smack/smack_lsm.c
View File

@ -51,8 +51,10 @@
#define SMK_RECEIVING 1
#define SMK_SENDING 2
#ifdef SMACK_IPV6_PORT_LABELING
static DEFINE_MUTEX(smack_ipv6_lock);
static LIST_HEAD(smk_ipv6_port_list);
#endif
struct kmem_cache *smack_rule_cache;
int smack_enabled __initdata;
@ -389,7 +391,7 @@ static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead,
/**
* smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
* @mode - input mode in form of PTRACE_MODE_*
* @mode: input mode in form of PTRACE_MODE_*
*
* Returns a converted MAY_* mode usable by smack rules
*/
@ -1213,6 +1215,7 @@ static int smack_inode_getattr(const struct path *path)
/**
* smack_inode_setxattr - Smack check for setting xattrs
* @mnt_userns: active user namespace
* @dentry: the object
* @name: name of the attribute
* @value: value of the attribute
@ -1339,6 +1342,7 @@ static int smack_inode_getxattr(struct dentry *dentry, const char *name)
/**
* smack_inode_removexattr - Smack check on removexattr
* @mnt_userns: active user namespace
* @dentry: the object
* @name: name of the attribute
*
@ -1398,6 +1402,7 @@ static int smack_inode_removexattr(struct user_namespace *mnt_userns,
/**
* smack_inode_getsecurity - get smack xattrs
* @mnt_userns: active user namespace
* @inode: the object
* @name: attribute name
* @buffer: where to put the result
@ -1619,13 +1624,14 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd,
}
/**
* smack_mmap_file :
* Check permissions for a mmap operation. The @file may be NULL, e.g.
* if mapping anonymous memory.
* @file contains the file structure for file to map (may be NULL).
* @reqprot contains the protection requested by the application.
* @prot contains the protection that will be applied by the kernel.
* @flags contains the operational flags.
* smack_mmap_file - Check permissions for a mmap operation.
* @file: contains the file structure for file to map (may be NULL).
* @reqprot: contains the protection requested by the application.
* @prot: contains the protection that will be applied by the kernel.
* @flags: contains the operational flags.
*
* The @file may be NULL, e.g. if mapping anonymous memory.
*
* Return 0 if permission is granted.
*/
static int smack_mmap_file(struct file *file,
@ -2603,7 +2609,6 @@ static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
mutex_unlock(&smack_ipv6_lock);
return;
}
#endif
/**
* smk_ipv6_port_check - check Smack port access
@ -2666,6 +2671,7 @@ static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
return smk_ipv6_check(skp, object, address, act);
}
#endif
/**
* smack_inode_setsecurity - set smack xattrs
@ -2852,8 +2858,9 @@ static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
SMK_CONNECTING);
}
if (__is_defined(SMACK_IPV6_PORT_LABELING))
rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);
#ifdef SMACK_IPV6_PORT_LABELING
rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);
#endif
return rc;
}
@ -3051,7 +3058,7 @@ static int smack_sem_associate(struct kern_ipc_perm *isp, int semflg)
}
/**
* smack_sem_shmctl - Smack access check for sem
* smack_sem_semctl - Smack access check for sem
* @isp: the object
* @cmd: what it wants to do
*
@ -3197,7 +3204,7 @@ static int smack_msg_queue_msgsnd(struct kern_ipc_perm *isp, struct msg_msg *msg
}
/**
* smack_msg_queue_msgsnd - Smack access check for msg_queue
* smack_msg_queue_msgrcv - Smack access check for msg_queue
* @isp: the object
* @msg: unused
* @target: unused
@ -3206,8 +3213,10 @@ static int smack_msg_queue_msgsnd(struct kern_ipc_perm *isp, struct msg_msg *msg
*
* Returns 0 if current has read and write access, error code otherwise
*/
static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp, struct msg_msg *msg,
struct task_struct *target, long type, int mode)
static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp,
struct msg_msg *msg,
struct task_struct *target, long type,
int mode)
{
return smk_curacc_msq(isp, MAY_READWRITE);
}
@ -4634,7 +4643,7 @@ static int smack_inode_copy_up(struct dentry *dentry, struct cred **new)
/*
* Get label from overlay inode and set it in create_sid
*/
isp = smack_inode(d_inode(dentry->d_parent));
isp = smack_inode(d_inode(dentry));
skp = isp->smk_inode;
tsp->smk_task = skp;
*new = new_creds;

26
security/smack/smack_netfilter.c
View File

@ -18,27 +18,7 @@
#include <net/net_namespace.h>
#include "smack.h"
#if IS_ENABLED(CONFIG_IPV6)
static unsigned int smack_ipv6_output(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
struct sock *sk = skb_to_full_sk(skb);
struct socket_smack *ssp;
struct smack_known *skp;
if (sk && sk->sk_security) {
ssp = sk->sk_security;
skp = ssp->smk_out;
skb->secmark = skp->smk_secid;
}
return NF_ACCEPT;
}
#endif /* IPV6 */
static unsigned int smack_ipv4_output(void *priv,
static unsigned int smack_ip_output(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
@ -57,14 +37,14 @@ static unsigned int smack_ipv4_output(void *priv,
static const struct nf_hook_ops smack_nf_ops[] = {
{
.hook = smack_ipv4_output,
.hook = smack_ip_output,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP_PRI_SELINUX_FIRST,
},
#if IS_ENABLED(CONFIG_IPV6)
{
.hook = smack_ipv6_output,
.hook = smack_ip_output,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP6_PRI_SELINUX_FIRST,

11
security/smack/smackfs.c
View File

@ -693,9 +693,7 @@ static void smk_cipso_doi(void)
printk(KERN_WARNING "%s:%d remove rc = %d\n",
__func__, __LINE__, rc);
doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
if (doip == NULL)
panic("smack: Failed to initialize cipso DOI.\n");
doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL | __GFP_NOFAIL);
doip->map.std = NULL;
doip->doi = smk_cipso_doi_value;
doip->type = CIPSO_V4_MAP_PASS;
@ -714,7 +712,7 @@ static void smk_cipso_doi(void)
if (rc != 0) {
printk(KERN_WARNING "%s:%d map add rc = %d\n",
__func__, __LINE__, rc);
kfree(doip);
netlbl_cfg_cipsov4_del(doip->doi, &nai);
return;
}
}
@ -831,6 +829,7 @@ static int smk_open_cipso(struct inode *inode, struct file *file)
static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
size_t count, loff_t *ppos, int format)
{
struct netlbl_lsm_catmap *old_cat;
struct smack_known *skp;
struct netlbl_lsm_secattr ncats;
char mapcatset[SMK_CIPSOLEN];
@ -920,9 +919,11 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
if (rc >= 0) {
netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat);
old_cat = skp->smk_netlabel.attr.mls.cat;
skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
synchronize_rcu();
netlbl_catmap_free(old_cat);
rc = count;
/*
* This mapping may have been cached, so clear the cache.